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Diffstat (limited to 'util.h')
| -rw-r--r-- | util.h | 52 |
1 files changed, 52 insertions, 0 deletions
@@ -0,0 +1,52 @@ +/* --*- c -*-- + * Copyright (C) 2013 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 and/or 3 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef HH_ENSC_VDR_INPUTDEV_UTIL_HH +#define HH_ENSC_VDR_INPUTDEV_UTIL_HH + +#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof(_a)[0]) + +inline static bool test_bit(unsigned int bit, unsigned long const mask[]) +{ + unsigned long m = mask[bit / (sizeof mask[0] * 8)]; + unsigned int i = bit % (sizeof mask[0] * 8); + + return (m & (1u << i)) != 0u; +} + +inline static void set_bit(unsigned int bit, unsigned long mask[]) +{ + unsigned int i = bit % (sizeof mask[0] * 8); + + mask[bit / (sizeof mask[0] * 8)] |= (1u << i); +} + +inline static void clear_bit(unsigned int bit, unsigned long mask[]) +{ + unsigned int i = bit % (sizeof mask[0] * 8); + + mask[bit / (sizeof mask[0] * 8)] &= ~(1u << i); +} + +inline static void change_bit(unsigned int bit, unsigned long mask[]) +{ + if (test_bit(bit, mask)) + clear_bit(bit, mask); + else + set_bit(bit, mask); +} + +#endif /* HH_ENSC_VDR_INPUTDEV_UTIL_HH */ |